Table of Content

24 December 2021, Volume 41 Issue 6

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A Tide Gauge Verification Device Based On Image Recognition

YAN Tian, LI Fan

2021, 41(6):  1-5.  doi:10.12060/j.issn.1000-7202.2021.06.01

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According to the verification and calibration requirements of tide gauge, a tide gauge verification device based on image recognition is proposed. The device establishes the internal correlation between tidal water level and image recognition, and is composed of water tower system, water supply and drainage system, servo system, central control system and software system. the device realizes the image recognition of tidal water level changes under closed-loop control, accurately detect the reading value of transparent pipe water-base line and indium steel ruler tick mark, and can simulate the semi-diurnal tide and diurnal tide variation rules. It has manual, automatic and mobile APP remote control function. Finally, this thesis analyzes and evaluates the measurement characteristics of the device. The results show that the device can meet the verification and calibration requirements of float-type tide gauge, acoustic tide gauge and pressure tide gauge, and has a good.

Design of Vibration Transfer Structure for Temperature Sensitivity Testing Device of Vibration Sensor

DAI Yi-lin, YANG Xiao-wei , ZHU Gang

2021, 41(6):  6-10.  doi:10.12060/j.issn.1000-7202.2021.06.02

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The material selection and structural design scheme of vibration transmission mechanism were discussed, and its modal analysis and test, heat transfer characteristic test and so on were carried out. The results show that the mechanism has good stiffness and heat insulation characteristics, and can meet the calibration requirements of temperature sensitivity of vibration sensor.

Research on Air Buoyancy Correction of Gas Mass Weighing

SUN Feng-ju, YAN Lei, BAITian, HUANG Qi-gang, HUO Rui-dong

2021, 41(6):  11-14.  doi:10.12060/j.issn.1000-7202.2021.06.03

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The mass value of gas is one of the most basic traceability parameters in gas flow measurement, and one of the common means to obtain the mass is to use the weighing method. The weighing of gas mass has its particularity compared with liquid in the principle of air buoyancy correction. In this paper, from the perspective of measurement principle and mechanical analysis of weighing equipment, as well as another perspective of the concept of conventional mass and vacuum mass in the field of mass measurement, the correction methods of direct weighing and substitution weighing are analyzed. Finally, a complete air buoyancy correction formula for gas mass weighing is given, and the buoyancy correction which is easy to be ignored in gas mass weighing is expounded.

Research on the Whole System Test of Multiple Trajectory Selection Technology for Deep Space Exploration Launch Vehicle

Dong Yu-hong, Wang Jian-ming, Huang Bing, Liu Bing, Li Mao, Hu Yuan-wei

2021, 41(6):  15-22.  doi:10.12060/j.issn.1000-7202.2021.06.04

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Specific to the situation that the deep space exploration task's fewer launch opportunities and narrower launch window, and that bigger launch time deviation can cause more propellant consumption during the deep space probe’s orbit correction process, this paper present the application of multiple trajectory selection technology in the launch vehicle’s testing and launching process, and then provide a electrical implementation scheme, and at last the whole system test scheme for multiple trajectory selection technology is also given. Adopting the system testing technology based on requirement, aiming at all kinds of abnormal working conditions that may occur in the real application scenarios of the system, a number of system-wide test cases were designed, that ensures the successful application of multiple trajectory selection technology in launch mission.

Research on The Driving Technology of Energy Storage High Power Pulse Laser

WANG Kai-lei, WU Chun-chan, WANG Xiao-guang, LIU Ke, BAO Chen-xing, GUO Tian-mao, ZHU Hao

2021, 41(6):  23-27.  doi:10.12060/j.issn.1000-7202.2021.06.05

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A driving method of high power pulsed laser is introduced. By analyzing the energy storage characteristics and working principle of the energy storage element, the driving circuit of the energy storage type high power pulse laser is proposed and designed. The high repetition frequency pulse output is realized through the external signal driven MOSFET, and the driving performance of 25ns pulse width and 30A current is achieved. Using Multisim simulation analysis, the circuit principle is verified, the circuit parameters are optimized, and the actual circuit is tested at last, which is identical with the simulation results. This circuit realizes the design of energy storage high power pulse laser drive circuit by means of inductive energy storage conversion and energy storage release, which has wide application value in low voltage environment circuit.

Research of ground integrated testing equipment simulation training system for a UAV

ZHAO Yu-liang, LI Zhi-qiang, HUANG Jie

2021, 41(6):  28-33.  doi:10.12060/j.issn.1000-7202.2021.06.06

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In order to solve the problem of lack equipment training means, a general simulation platform is designed based on C# combined with the secondary development of the EON and LabWindows/CVI simulation program, the simulation operation of maintenance rules is realized. After testing, the system simulation environment is lifelike, the communication between subsystems if normal, and the response is fast and accurate, the whole process simulation operation of ground testing of a UAV can be completed, the system meets the design requirements. Through the practice of teaching training, the system solves the problem of lack of training means, and provides an important support for generation of combat effectiveness of the equipment.

An Method of Astronomical Attitude Measurement Based on Active Star Seeking

ZHANG Xing-fan, ZHANG Guang-jun

2021, 41(6):  34-40.  doi:10.12060/j.issn.1000-7202.2021.06.07

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The attitude measurement equipment based on biaxial servo usually adopts the double reference vector method to measure the attitude, which has high updating rate, simple and reliable. However, the accuracy of attitude measurement is not high due to the influence of atmospheric disturbance and air cover difference. An active star search method for astronomical attitude measurement is proposed, the generation of star search strategy is analyzed, the survey observation and attitude calculation process are briefly introduced, and the practical application effect of this method is verified by experiments, which provides an important reference for the development of a new type of astronomical attitude measurement system for ships.

Application and Consideration of PXI Bus Technology in Aero-engine Test

HUANG Cheng, SUN Jing-bo, XU Zhen-han

2021, 41(6):  41-47.  doi:10.12060/j.issn.1000-7202.2021.06.08

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Through the application and exploration of PXI (PCI extensions for Instrumentation bus technology in calibration, this paper hopes to realize a kind of calibration technology and scheme aiming at the high efficiency automation of comprehensive simulation parameters and low resource demand, so as to support the urgent task guarantee requirements of engine scientific research and test.

Phase unwrapping method based on grating projection 3D measurement

ZHANG Rong-zhuo, LIU Ke, SONG Jincheng, GUO Tian-mao, SUN Zeng-yu, GAO Yue, WU Tong, PAN Zhao-yi, LUO Xiao-Tao

2021, 41(6):  48-52.  doi:10.12060/j.issn.1000-7202.2021.06.09

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In order to improve the accuracy and efficiency of the phase solution of the grating fringe, this paper optimizes the multi-frequency heterodyne and phase shift method from the perspective of time series. According to the importance of the unfolding frequency, the phase shift of the asynchronous number is selected to solve the main value of the phase. The four-step phase shift is used for the main frequency, and the three-step phase shift is used for other frequencies. Finally, the heterodyne principle is used to expand the phase of the grating fringe. The experimental results prove the feasibility of the algorithm. Compared with the traditional Gray code expansion method, this optimization algorithm has higher accuracy and fewer projected images. Compared with the conventional multi-frequency heterodyne method, it can project fewer images without reducing the accuracy and improve the measurement efficiency.

A Method for Measuring the Tension of Cable Structure

HUA Yue, LIU Ting-ting , MA Xiao-fei, SHI Tian

2021, 41(6):  53-56.  doi:10.12060/j.issn.1000-7202.2021.06.10

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In order to accurately obtain the tension of the flexible cable network structure on the satellite mesh antenna, a contact cable net structure tension measurement method with two actions is proposed. In the process of measurement the influence of three-point bending of rope on the measurement results is eliminated, and the tension value of the pre-tension rope with fixed supports at both ends is determined. The design idea of tension measurement system is put forward, and the tension measurement system is designed, which has certain application value.

Multi-channel Induction Synchronizer’s High-Precision Fusion and Implementation on FPGA

LI Tai-ping, JIANG Lin, CHEN Wei-nan, XIA Zhen-tao, HU Ji-bao

2021, 41(6):  57-62.  doi:10.12060/j.issn.1000-7202.2021.06.11

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Based on the working principle of the induction synchronizer, the corresponded excitation and filter circuits are designed, and the coarse and fine channel angle information of the absolute induction synchronizer is obtained through the solving unit. Aiming at the measurement characteristics of the multi-channel induction synchronizer, a method of multiple harmonic injection is adopted to fuse the data of the coarse and fine channels. The angle measurement accuracy of the system is effectively improved. The FPGA-based fusion algorithm is designed to ensure that the measurement unit can track with high precision in real time.

Research on Anti-jamming Tracking Algorithm Based on Kernel Correlation Filtering

LIU Le, LIU Yong , ZHAO Zi-lun, LI Xu, LIU Tian-xu

2021, 41(6):  63-67.  doi:10.12060/j.issn.1000-7202.2021.06.12

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Aiming at the problem that the kernel correlation filtering target tracking algorithm (KCF) fails to track when the target scale changes, is severely occluded, and out of the field of view, the anti-jamming design is based on the kernel-related filtering tracking algorithm from two aspects. Aiming at the problem that KCF's template update method is likely to cause template pollution when the target is severely occluded, an incremental template update strategy is proposed to enhance the robustness of the algorithm; for KCF's lack of ability to deal with target scale changes, scale adaptive estimation is carried out. To adapt to changes in the target form. Finally, the feasibility and effectiveness of the two anti-jamming designs are verified and analyzed through experiments

Development status and analysis of micro nano force measurement technology

ZHONG Shan, GAO Bing-tao, CEN Ge , WANG Xiao-san, REN Da-cheng

2021, 41(6):  68-75.  doi:10.12060/j.issn.1000-7202.2021.06.13

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The development status of micronewton/nanonewton force measurement technology in recent years is introduced. The measurement methods, measurement and research results of micronewton/nanonewton force value are compared, and the characteristics and applicability of different test methods are pointed out. Based on the current development trend of micronewton/nanonewton force measurement field and combined with the development needs of the industry, the problems needing attention in the research of micro nano force measurement technology are put forward.

Review on Pressure Measuring System of Pressure Scanning Valve

WANG Huan, ZENG Qing-hua

2021, 41(6):  76-81.  doi:10.12060/j.issn.1000-7202.2021.06.14

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The development process from multi-point pressure measuring system to pressure scanning valve pressure measuring system is summarized. The main technical parameters and research progress of foreign products as well as the research status of domestic pressure scanning valve pressure measuring system are analyzed. The improvement and development direction of pressure scanning valve pressure measuring system under the demand of high precision and stability in the future are prospected.

Progress of Noise Standard and Measurement Method in Military Aircraft Cabin

WANG Dong-jie , MAO Hong-yu, ZHAO Yu-ying, DONG Zhi-ming

2021, 41(6):  82-85.  doi:10.12060/j.issn.1000-7202.2021.06.15

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The noise in military aircraft cabin was an important index to evaluate the noise characteristics of a military aircraft and the combat effectiveness. The research on the standard limit of military aircraft cabin noise was the basis of the aircraft noise design. This paper reviewed the relevant military standards of international military power and that of China. In addition, the measuring method of military aircraft cabin noise were introduced. The results have some reference value for the design and noise evaluation of next-generation aircraft.